Chock block



Patented Jan. 1, 1929.

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EDWARD EVANS, 0F DETROIQ'MICHIGAN, ASSIGNOR T0 EVANS AUTO LOADING CO. INC., OF DETROIT, MICHIGAN, A COREORATION OF DELAWARE.

CHOOK BLOCK.

Application filed April 11, 1927. Serial No. 182,799.

This invention relates to certain new and useful improvements in chock blocks for vehicle wheels, and has more particular reference to that type of chock block adapted to be secured to the floor of a freight car and having a curved bearing surface for engagement with a segmental portion of the tire of a motorvehicle wheel, for preventing movement of the vehicle during shipment.

In view of certain serious objections which have been found with regard to chock blocks of the present kind,,made from wood or metal, it has heretofore been proposed to mold chock blocks of this kind of artificial stone or concrete in order to overcomethese objections. However, although certain of the objections were overcome to a considerable extent by the formation of chock blocks of artificial stone or concrete. such concrete chock blocks presented certain other serious objections in that they were excessively heavy and not as durable as required due to the brittle or frangible nature of the concrete material.

It is accordingly an object of the present invention to provide a composition chock block which will embrace all of the desirable features of wood, metal and concrete chock blocks and at the same time be devoid of the objections of the latter.

In attaining the above objects, I provide a composition chock block made from a plastic material composed of light ingredients or materials and shaped and compressed in a suitable mold under high compression so as to provide a composite body or block of light weight and having a dense texture of great tensile strength.

I have further found that chock blocks formed of composition material are obj ectionable in that gummy and other materials in the composition produce a very objectionable staining and otherwise objectionable effect upon the surface of the tire of the vehicle wheel, where engaged with the bearing face of the chock block Itis accordingly a further important object of the present invention to provide the curved or arcuate bearing surface of a composition block with a protective covering by means of which the tire surface is prevented from direct contact with the composition material of the block so as to prevent staining of the tire and other detrimental effects due to the rough surface presented by the composition material of which the block is formed.

A more specific object of the inventionis to provide a smooth covering of clean nonstaining material upon the bearing surface of the chock block, the covering being pressed into the bearing surface during themanufacture of theblock so as to constitute a sub- I stantially unitary part thereof.

More specifically, the present invention contemplates the provision of a bearing surface covering of the above kind embodying sheet material which may be readily placed and pressed into the bearing surface of the block during its manufacture.

The invention will be better understood from the following when considered in con- '3 nection with the accompanylng drawing, in

which, y s

Figure 1 1s a perspective View ofa compositlon block constructed and provided with a bearing surface covering, in accordance with the present invention; Figure 2 is a central longitudinal sectional view thereof taken upon line 2-2 of Figure 1; and

Figure 3 is a 33 of Figure 1.

Referring more in detail tothe drawing, the present chock block consists of a body 5 of generally well known form including a fiat base surface 6, a rear wall7, a curved bearing surface 8 for engagement with a segmental portion of the vehicle tire, and a reartransverse section'upon line wardly projecting heel 9 coextensive with the base of the block through which suitable fasteners are adapted to be driven in the usual manner to facilitate fastening of the block to the floor of the freight car or the like. Additional side recesses may be provided as at 10 to facilitate driving of furs ther fasteners through the block at the sides of the latter and into the floor.

In accordancewith the present invention the block or body 5 is molded from a light plastic composition capable of compression to have a dense texture, to be devoid of brittleness or frangibility, and possessing great tensile strength. For this purpose, the composition preferably is composed of moistened asphalt and sawdust or asphalt'and cinders, the sawdust or cinders being quite finely divided. A suitable quantity of this composition is placed within a properly formed mold, and the plastic mass is forcedinto the shape described under heavy compression produced hydraulically or otherwise. The resultant concrete, and at the same time the device will be of an extremely light weight as is desirable in devices of this kind. The product will not only beconsiderably lighter in weight than-a block composed of concrete or artificial stone, but it will not possess the objectionable brittleness or frangibility of the latter, thus insuring a product which will not readily become defective by reason of shocks and jars during use.

An important object of the present invention i-s to provide simple and effective means for protecting the surface of the tire usually engaged with the bearing surface S from becoming marred and stained. For this pur pose, I press a covering 11 of clean smooth material into the bearing surface 8 during the manufacture of the block, said covering extending throughout the usual tire groove when the same is provided in the bearing surface as shown. This covering 11 may consist 'of a strip of suitable sheet material such as paper, fabric or metahand is preferably extended slightly beyond the sides of the tire receiving groove of the bearing face as shown at 12 in Figure 1, and Figure 3. WVhen a covering is provided in the above manner, the tire will be prevented from direct contact with the surface ofthe composition material so that it will not become stained due to the gummy or other staining material contained in the composition. In addition to this, the covering 11 will prevent direct engagement of the rough surface of the composition material of the block with the tire, but the primary object is to prevent the staining, it being appreciated that soft linings have heretofore been provided simply to prevent chafing.

From the foregoing description it is be lieved that the construction as well as the advantages of the present invention will be readily understood and appreciated by those skilled in the art. 7

Minor changes may be made without departing from the spirit and scope of the invention as claimed.

What I claim as new is 1. The combination with armolded compo sition chock block having a curved tire bearing surface, of a smooth covering on said bearing surface.

2. The combination with a molded composition chock block having a curved tire bear ing surface, of a smooth covering on said bearing surface, said covering embodying a strip of sheet material pressed into the block on said bearing surface.

5. The combination with a. molded compo- I sition chock block having a curved bearing surface formed with a tire-receiving groove, of a smooth covering applied to the block to completely cover the surface of the wall of said groove, said covering embodyinga strip of sheet material pressed into the material of the block. 1 V v 6. The combination with a molded composition chock blockhaving a curved bearing surface formed with a tire-receiving groove, of a smooth covering applied to the block to completely cover the'surface of the wall of said groove, saidcovering being pressed into the material of the block.

In testimony whereof I aflix my signature.

EDWARD S. EVANS.

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